Electric regulation.



' J. L. GREVBLING.

ELECTRIC REGULATION.

APPLICATION FILED 111311.13, 1911.

Patefited Sept. 26, 1911.

W/M ESSES //WENTOR UNITED STATES PATENT onn on.

JOHN L. CREVELING, OF NEW YORK, N. Y.,

AssiGNoR T SAFETY CAR HEATJCNG AND LIGHTING COMPANY, A CORPQRATION OF NEW JERSEY.

' .ELECTRIC REGULATION.

Specification of Letters Patent.

Patented Sept. 26, 1911.

Application filed April 1'3, 1911. Serial No. 620,742.

to provide ineanswhereby the voltage of a generator will be automatically governed in accordance with the duty thereof.

Figure 1 represents one type of system embodying my invention. Fig. 2 represents a modified form of system embodying my invention.

press the carbons 3 and decrease the resistance thereof. The lever 5 is provided at one extremity with the core 7 and thus the sistance 3 may be controlled by movement of core 7. The resistance 4- is controlled by the lover 8 normally drawn in an upward direction as by the adjustaliile spring 9, and provided with a core 10 which, by its movement, may thus control the resistance 4. 11 reprc sents a generator lead which for sake of example will be considered as the positive and is carried to one side of the automatic switch 12 which may be any of the well-known types adapted to complete circuit between the generator and the battery under proper conditions. The opposite side of this switch is connected with the lead 13 in com! niunieation with the positive side of "the storage batteryfil Hid the positive side of. the lamps or other translating devlces 1nd1--" rated at 14. The translating devices have their negative terminals connected to the translating main 15 which is carried to one side of the translation circuit switch 16 conwlcctcd with one end of the regulating device 17--in this instance indicated as a variable resistance of the carbon pile variety forsake of simplicity. The opposite end of the car bon pile 17 is connected with the lead 18 in communication with the negative side of the storage battery -31 and one end of the winding or solenoid 19, the opposite end of which is connected with the negative brush of the generator: The regulating element 17 is controlled by a lever 20 normally drawn in a downward direction as by adjustable Spring 21, which tends to compress the carbons and lower the resistance thereof. The lever 90 is provided at one extremity with the core 22 of iron, or other magnetic ma;

terial, surrounded by the coil 23 in shunt across the translating circuit as indicated.

24. is a fine winding, or coil, surrounding the core 7 in such manner that energization of the same tends to depress the lever 5 against the action of the spring 6 and increases the resistance The coil 24 is placed in shunt across the generator circuit as by means of wires 25 and 26, or acrossthat part of the system, the voltage of which it is desired to have control the resistance 3. The core 7 is also surrounded bye solenoid 27 in shunt across the resistance 17 as by wires 28 and 2G. The coil 27 is so wound that as the re sistance 17 is increased and the drop across the sameincreased, the ciirrent shunted around the resistance 17 through the wind ing 27 will assist the coil 24 in tending to overcome the spring 6 for a purpose that will hereinafter appear. The solenoid 19 surrounding the core 10 is so wound that energization of the same tends to depress the lever 8 against the action of spring 9 and increase the resistance 4.

The practical operation of my invention as shown in Fig. 1 is substantially as toL lows: If we consider the generator running at such'speed as to properly charge the battery 31, the switch 12 will be closed and current will. flow from the generator through the lead 11, switch 12, lead 123, battery 31, lead 18 and solenoid 19 to the generator". I

now so adjust the spring 9 that when the maximum desired current-is delivered to the battery, any increase in the said currentwill cause the core 10 to be drawn downwardly and the resistance 1 increased in such manner that this current will not be exceeded. If new this charging current be delivered to the battery until the volt ge thereof rises' generator to taper oil and the regulation of the generator will be automatically carried.

4 out by the coil 24 producing a voltage regulated generator throughoutspeed changes and the maximum voltage desired across the battery will not be exceeded. In some instances with the batteries now in use the rise inc-battery voltage vfrom the normal to a fully charged state is in the neighborhood of 25 per cent. or even more and it'is desired at times to carry the battery charge up to this maximum voltage for various reasons. However, if a load be thrown upon the battery itfalls almost immediately from this high-{voltage to its normal and if a load be carried in nmltiplewith the battery and the battery carried at its highest charged voltage it is obvious that the total load across the battery including any regulating means therefor must be carried at the high voltage 'of the battery. If the translating circuit is to be operated across the battery when its voltage has fallen to the normal and if the voltage of the battery risc some 25 per cent. at times, there must be some intervening regulator for causmg a op between the battery and generator ano he translating devices, which regulator is usually in the form of a variable resistancc, dissipating in waste heat this drop be tween the two circuits which, of course,

1 represents aloss of the amount dissipated and one of the principal objects of my present invention is to minimize this loss and which object niay be accomplished in the following manner: When the generator is running as above described and the battery 31 charged until the maximum desired voltage is held across the generator by the coil 24, if the lamps or other translating devices be thrown upon the translating cir-- cuit as by closing of the switch 16, l now so adjust the spring- 21 that the solenoid 23 will raise the core 22 and increase the rcsistancc 17 so as to lower the voltage across the translation circuit. to that. which the battery alone is able to supply when in its normal condition, and as this is considerably below that voltage across the highly charged battcry there will be considerable drop across the resistance 17. This drop will cause currcnti to [low from the lead 1'15 through wire 28, coil 27 andwirc ittto the main in therefore, a considerable of the energy which would be dissipated in heat in the resistance 17, provided the high fully charged voltage 'were held across the bat- "tery 31 and thenormal voltage across the translating devices, is avoided in an obvious manner by operating the whole system ata volt-age more nearly that of the normal charging voltage of the battery when slightly below its fully charged state. it

will. be noted that the coil- 19 in Fig. 1 is in series with the main generator lead and, therefore, controls the resistance -11 in accordance with the total output ol the gcncr ator which can not exceed a predetermined limit regardless of how low a voltage will produce this maximum desired current.

In Fig. 2 there is shown a portion of a system similar to the one shown in Fig. l

with the exception that the coil 10 in the main circuit is replaced by the coil '30 in the battery circuit so that the current flowing to the battery only is that. current which. controls the resistance 4 in such manner as to prevent an excess regardless of voltage.

Like nun'ierals are used in both figures to indicate corresponding parts and the operation oli the modification shown in Fig. 2 may be readily followed from the above descrip tion of the operation shownin Fig. 1.

l do not wish in any way to limit. myself to details of ctmstruetion or exact detail of operation setiorth in this specification and .thc fdifawing thereof which are intended to ii'lcrely show an embodiment ot my invention and from which wide departure may be made without departing lrom the spirit and scope of my invention which is as set forth in the following claims: I

l. The combination with a generator, :1 main circuit and a. translation circuit, of means lmregulating the grn'icrat-or responsive to current. fluctuations, means for regulating the generator responsive to voltage lluct uat-ions, i'ncaris'lor rcgulating the translation circuit: and .n'lcans for a fleeting the voltage responsive means affected by the difference in potential across the translation circuit regulator. D

2. The combination with a generator and regulating means therefor, meanslor'conand this current will tend to assist the coil trolling said regulating means responsive to current fluctuations, means for affecting said regulating means responsivg to voltage fluctuations, a translation circuit, a translation circuit regulator and means whereby the degree of operation of said translation circuit regulator affects the voltage responsive means.

3. The combination with a generator and regulating means therefor, means for controlling said regulating means responsive to current -fluctuations, means for controlling 1 said regulating means responsive to voltage fluctuations, a translation circuit, a translation clrcuit regulator and means whereby the operation of said translation circuit regulator adjusts the standard of the voltage responsive means. i

regulator affects the means.

5. The combination with a generator, a storage battery and a translation circuit, of means for regulating the generator responsive to voltage fluctuations across the storage battery, a regulator for the translation circuit and means whereby the potential difference across the same affects the voltage regulating means. 1

6. The gcombination with a generator, a work circuit, a storage battery and a translation circuit, of means for regulating the generator responsive to voltage fluctuations, means for regulating the generator responvolt-age responsive "sive to current fluctuations, means for regulating the voltage across the translation circuit and means whereby the difference in potential caused by the' said translation circuit regulating means adjusts the standard of operation of the voltage res onsive mesa-1s.-

JOHN L. CR VELING. Witnesses:

' CHAS. MOO. CHAPMAN,

-ANNA MARIE WALL.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

